Reduce 8051-based MCU external interrupt control method

Abstract

The invention discloses a reduce 8051-based MCU (micro control unit) external interrupt control method, which comprises a microprocessor core R8051 Core (reduce 8051 core), an MCU debugging module Debug System and an interrupt processing module ISR (interrupt service routine), wherein the microprocessor core R8051 Core is connected with the MCU debugging module Debug System and the interrupt processing module ISR; various peripheral equipment is integrated through SFR (special function register) bus; and interrupt requests generated by the peripheral equipment are uniformly transmitted to the interrupt processing module ISR to perform arbitration processing. By the method, MCU external interrupt supports all pins and a user can configure corresponding registers through software to correspond to the pins, so the transplanting difficulty caused by different pin positions is solved and the development cost is reduced; each pin supports selection of event trigger modes, and low-level trigger, descending edge trigger, ascending edge trigger and jump trigger can be used correspondingly, so the application scenes are changed to be flexible and abundant; and universal RTL code design is designed, the development period of a chip can be shortened and the verification work amount is reduced.

Description

technical field [0001] The invention relates to a control method, in particular to an external interrupt control method based on a simplified 8051 MCU. Background technique [0002] External interrupt is a common function of MCU. It is used to correspond to external events. The external interrupt of the classic 8051 only has two input pins. Different chip manufacturers have different pin configurations. When a new MCU is released, it is often due to The mismatch of the pin position has to modify the bottom board or re-develop, which virtually increases the cost of the customer, thus bringing unnecessary resistance to the promotion of the chip. In addition, there are only two classic external event trigger modes, which are low level and falling edge, which makes the application scenarios less flexible and configurable. When encountering other types of events, it must be realized by adding peripheral devices. Contents of the invention [0003] The object of the present inve...

AI Technical Summary

Problems solved by technology

[0002] External interrupt is a common function of MCU. It is used to correspond to external events. The external interrupt of the classic 8051 only has two input pins. Different chip manufacturers have different pin configurations. When a new MCU is released, it is often due to The mismatch of the pin position has to modify the bottom board or re-develop, which virtually increases the cost of the customer, thus bringing unnecessary resistance to the promotion of the chip

In addition, there are only two classic external event trigger modes, which are low level and falling edge, which makes the application scenarios less flexible and configurable. When encountering other types of events, it must be realized by adding peripheral devices

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